#include <stdio.h>
//define a value for PIE
#define PIE 3.14

int main(void)
{
  //initialize variable
  float radius;

  //get user input and store it
  printf("Enter the radius of your circle: ");
  scanf("%f", &radius);

  //do the maths
  float area;
  area = PIE * (radius * radius);

  printf("The area of your circle is %f", area);


}
